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Understanding 9/11hpr3394 :: Be an XML star with xmlstarlet
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Summary: Parse XML from the terminal
Source: http://hackerpublicradio.org/eps.php?id=3394
Original audio: http://archive.org/download/hpr3394/hpr3394_source.flac
Source: http://hackerpublicradio.org/eps.php?id=3394
Original audio: http://archive.org/download/hpr3394/hpr3394_source.flac
See the layout of an XML document
$ xmlstarlet elements planets.xml
xml
xml/sol
xml/sol/planet
xml/sol/planet/name
xml/sol/planet/albedo
xml/sol/planet
xml/sol/planet/name
xml/sol/planet/albedo
xml/sol/planet
xml/sol/planet/name
xml/sol/planet/albedo
See content of the planet node
$ xmlstarlet select -t --value-of '/xml/sol/planet' planets.xml
Mercury
0.11
Venus
0.7
Terra
0.39
Get the third instance of the planet node
$ xmlstarlet select -t --value-of '/xml/sol/planet[3]' planets.xml
Terra
0.39
Get only the planets with an albedo greater than 0.25
$ xmlstarlet select -t --value-of '/xml/sol/planet[albedo > 0.25]' planets.xml
Venus
0.7
Terra
0.39
Get only the planets closer to Sol than the third planet
$ xmlstarlet select -t --value-of '/xml/sol/planet[position() < 3]' planets.xml
Mercury
0.11
Venus
0.7
Learn more XPath functions at Mozilla Developer Network.
Download xmlstarlet from xmlstarlet.sourceforge.net.
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